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An Isolated Interleaved Active-Clamp ZVT Flyback-Boost Converter with Coupled Inductors
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| Author(s) |
SHI Jianjiang; HU Min; HE Xiangning; LI Wuhua |
| Abstract |
The fundamental limitations of interleaved flyback converters for high step-up DC/DC applications are analyzed in this paper. A novel interleaved flyback-boost converter is derived with further modifications on the interleaved flyback converter, which extends the voltage gain and reduces the voltage stress of the switch. The active-clamp circuits are employed to recycle the leakage energy. Both the main and the auxiliary switches can realize ZVT soft switching condition. The turn-off voltage spikes of the main switch are clamped by the active-clamp circuits. Due to the leakage inductance of the coupled inductors, the output diode reverse-recovery problem is alleviated dramatically. A 1 kW prototype with 40V-input-to-380V-output operating at 50 kHz switching frequency built in the lab verifies the effectiveness of the proposed converter. The efficiency of nearly 90\% at full load is achieved. More than 7\% efficiency improvements with active-clamp circuits are achieved compared with the case with RCD snubbers. |
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| Filename: | 0096-epe2007-full-10201509.pdf |
| Filesize: | 683.9 KB |
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| Type |
Members Only |
| Date |
Last modified 2008-01-11 by System |
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